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Backwards compatibility for REST API


Are there any compatibility guarantees for the Flink REST API or plans to
establish the same?

I'm asking since I noticed that the 1.5.1 release has an incompatible
change that prevents a 1.5.0 client to submit a job to 1.5.0 server
(FLINK-9280, removed endpoint /blobserver/port).

Such change is especially unexpected in a patch release, but even if it was
in 1.6.x, it is still problematic because it forces clients to upgrade.